Design of Shape Memory Alloy (SMA) Actuators

Rao, Ashwin

doi:10.1007/978-3-319-03188-0

Cited by 127 publications

(105 citation statements)

References 7 publications

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“…where ρt is the theoretical density of the fully dense Fe-28Mn-3Si alloy (i.e., 7.50 g/cm 3 ), ρs is the measured absolute density of sintered porous Fe-28Mn-3Si alloys. The weight of both the green and sintered compacts was measured using a precision electronic balance.…”

Section: Characterisation and Analysismentioning

confidence: 99%

“…Fe-Mn-Si alloys have been intensively investigated due to the so-called shape memory effect (SME) caused by the reversible phase transformation between face-cantered cubic (fcc) γ-austenite and hexagonal close-packed (hcp) ε-martensite [1][2][3]. In the family of metallic shape memory alloys (SMAs), Fe-Mn-Si SMAs exhibit relatively low costs of both raw materials and processing in comparison with their Ni-Ti alloys and Cu-based counterparts [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

Hodgson

Cao

2017

Preprint

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This work investigated the isothermal holding time dependence of the densification, microstructure, weight loss and tensile properties of Fe-Mn-Si powder compacts. Elemental Fe, Mn and Si powder mixtures with a nominal composition of Fe-28Mn-3Si (in weight percent) were ball milled for 5h and subsequently pressed under a uniaxial pressure of 400 MPa. The compacted Fe-Mn-Si powder mixtures were sintered at 1200 °C for 0, 1, 2 and 3 h, respectively. In general, the density, weight loss and tensile properties increased with the increase of isothermal holding time. A significant increase in density, weight loss and tensile properties occurred in the compacts being isothermally held for 1 h, as compared to those with no isothermal holding. However, further extension of isothermal holding time (2 and 3h) only played a limited role in promoting the sintered density and tensile properties. The weight loss of the sintered compacts was mainly caused by the sublimation of Mn in Mn depletion region on the surface layer of the sintered Fe-Mn-Si compacts. The length of the Mn depletion region increased with the isothermal holding time. A single α-Fe phase was detected on the surface of all the sintered compacts, and the locations beyond the Mn depletion region were comprised of a dual dominant γ-austenite and minor ε-martensite.

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Section: Characterisation and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

Hodgson

Cao

2017

Preprint

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“…1. SMAs have two unique properties: Shape memory effect (SME) and superelasticity (SE) [1,6,7]. The SME refers to the phenomenon that SMAs return back to their predetermined shapes upon heating.…”

Section: Introductionmentioning

confidence: 99%

“…The SME is easily found at the martensite phase, which mostly appears at a low temperature. Conversely, the SE is easily detected at the austenite phase, which is stable at a high temperature [1,3,7]. When SMAs in martensite are subject to external stress, they deform through a so-called detwining mechanism, which transforms different martensite variations to the particular one variation that can accommodate the maximum elongation.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on thermo-mechanical behavior of shape memory alloy actuator

Kurzawa

Stachowiak

2017

Archives of Electrical Engineering

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Abstract:The paper presents the design procedure and elaborated software for designing calculation of the shape memory alloy (SMA) actuator. The thermo-mechanical behavior of a linear SMA actuator has been studied. The experimental set-up was especially designed to perform the thermo-mechanical characterization of SMA wires. The stroke (s) -temperature (T) hysteresis characteristics have been determined. The cycle of heating and cooling has been performed under a constant load. The model for the SMA actuator s -T behavior has been proposed and successfully implemented. The selected results and conclusions have been presented. The concept proposal of the linear actuator using the SMA wire has been given.

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Topologically Optimized Fingerless Versatile Gripper Actuated by a Shape Memory Alloy Coiled Garter Spring

et al. 2023

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The rapid advancements in 3D printing technologies offer immense design flexibility and the ability to create complex structures with high resolution. Using these cutting‐edge technologies and materials (i.e., a polylactic acid and fused deposition modeling), a novel design principle is introduced for a fingerless gripper, achieved through topological optimization. To realize the grasping capabilities, a coiled garter spring made of shape memory alloy (SMA) is incorporated at the end of the flexure beams. Based on the experiments, it is found that the gripper is very quick to respond, taking only 5 s to heat up and 15 s to cool down. This promising performance is achieved by carefully balancing the net force differential between the restoring force of the flexure beam and the force of the SMA coiled garter spring. In addition to its responsiveness, the gripper demonstrates a high force‐to‐weight ratio of 5.3, allowing it to lift heavy payloads of up to 4.91 N (0.5 kgf) despite its lightweight design (total weight of 94.2 g). Overall, this work showcases the potential of 3D printed fingerless grippers in terms of high holding strength, lightweight, low cost, and simple fabrication.

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Design of Shape Memory Alloy (SMA) Actuators

Cited by 127 publications

References 7 publications

Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

Effect of Sintering Time on the Densification, Microstructure, Weight Loss and Tensile Properties of a Powder Metallurgical Fe-Mn-Si Alloy

Investigation on thermo-mechanical behavior of shape memory alloy actuator

Topologically Optimized Fingerless Versatile Gripper Actuated by a Shape Memory Alloy Coiled Garter Spring

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